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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Computed tax expense at statutory federal rates	$ 3,874	$ 3,993	$ 7,054
Increase (decrease) in taxes resulting from:
State taxes, net of federal income tax benefit	559	1,131	1,627
Unrecognized tax benefits	(2,092)	263	171
Bargain purchase gain on business acquisition	(978)
Impact of the enactment of the Tax Cuts and Jobs Act (net)			1,089
Income tax credits	(812)	(819)	(689)
Foreign tax rate differential	2,145	341	(37)
Subpart F income			14
(Gain) on equity investments			(61)
Stock based compensation	377	366	277
Global intangible low-taxed income		249
Other	7	(322)	(300)
Total income tax expense (benefit)	$ 3,080	$ 5,202	$ 9,145

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